What is the right one?
The problems will be fixed at/on/in the next update?
The hits on google is respectively(in millions) 2,18/ 3 /3,8 .
That depends on whether "will be fixed" means that the problems "will undergo the activity of fixing during the next update" or that the problems "will be absent in the next update."I would only use "in".
I might also use 'at [the time of] the next update'.